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package scala.reflect
package reify
import scala.reflect.makro.ReificationError
import scala.reflect.makro.UnexpectedReificationError
trait Errors {
self: Reifier =>
import mirror._
import definitions._
lazy val defaultErrorPosition: Position =
mirror.analyzer.openMacros.find(c => c.macroApplication.pos != NoPosition).map(_.macroApplication.pos).getOrElse(NoPosition)
// expected errors: these can happen if the user casually writes whatever.reify(...)
// hence we don't crash here, but nicely report a typechecking error and bail out asap
def CannotReifyReifeeThatHasTypeLocalToReifee(tree: Tree) = {
val msg = "implementation restriction: cannot reify block of type %s that involves a type declared inside the block being reified. consider casting the return value to a suitable type".format(tree.tpe)
throw new ReificationError(tree.pos, msg)
}
def CannotReifyType(tpe: Type) = {
val msg = "implementation restriction: cannot reify type %s (%s)".format(tpe, tpe.kind)
throw new ReificationError(defaultErrorPosition, msg)
}
def CannotReifySymbol(sym: Symbol) = {
val msg = "implementation restriction: cannot reify symbol %s (%s)".format(sym, sym.accurateKindString)
throw new ReificationError(defaultErrorPosition, msg)
}
def CannotReifyConcreteTypeTagHavingUnresolvedTypeParameters(tpe: Type) = {
val msg = "cannot reify ConcreteTypeTag having unresolved type parameter %s".format(tpe)
throw new ReificationError(defaultErrorPosition, msg)
}
// unexpected errors: these can never happen under normal conditions unless there's a bug in the compiler (or in a compiler plugin or in a macro)
// hence, we fail fast and loudly and don't care about being nice - in this situation noone will appreciate our quiet nicety
def CannotReifyUntypedPrefix(prefix: Tree) = {
val msg = "internal error: untyped prefixes are not supported, consider typechecking the prefix before passing it to the reifier"
throw new UnexpectedReificationError(defaultErrorPosition, msg)
}
def CannotReifyUntypedReifee(reifee: Any) = {
val msg = "internal error: untyped trees are not supported, consider typechecking the reifee before passing it to the reifier"
throw new UnexpectedReificationError(defaultErrorPosition, msg)
}
def CannotReifyErroneousPrefix(prefix: Tree) = {
val msg = "internal error: erroneous prefixes are not supported, make sure that your prefix has typechecked successfully before passing it to the reifier"
throw new UnexpectedReificationError(defaultErrorPosition, msg)
}
def CannotReifyErroneousReifee(reifee: Any) = {
val msg = "internal error: erroneous reifees are not supported, make sure that your reifee has typechecked successfully before passing it to the reifier"
throw new UnexpectedReificationError(defaultErrorPosition, msg)
}
}
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